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Bug #22890 CLI setuid scripts don't run setuid
Submitted: 2003-03-26 03:27 UTC Modified: 2003-03-26 09:38 UTC
From: gavin at itmerge dot com Assigned:
Status: Not a bug Package: CGI/CLI related
PHP Version: 4.3.1 OS: Linux 2.4.18
Private report: No CVE-ID: None
 [2003-03-26 03:27 UTC] gavin at itmerge dot com
/* my sample script is */
echo posix_getmyeuid()."\n";

root#chown root.vhost /scripts/myscript
root#chmod 4710 /scripts/myscript
root#useradd -u 1001 gavin
root#usermod gavin -G vhost

i had to create /usr/local/bin/setuid_php
and chmod 4710 it to be able to make my php scripts run setuid root (i'm not a perl person i don't know if perl supports setuid but I know scripts that i pass thru 
/bin/zsh support setuid)

I don't really like having that script there :0 
because A, I'm learning but i'm learing quickly
that the more "permissions" you have the 
more you're likely to get a stuck up the rear end
and essentially that lets anyone become god on my system who might find it, I think i'm going to go move it outside of /usr/local/bin right now



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 [2003-03-26 04:05 UTC] gavin at itmerge dot com
whoops spelt posix_geteuid(); wrong :P
 [2003-03-26 09:36 UTC]
Modern kernels on Unix and Unix-like operating systems simply ignore set uid bit on shebang scripts (those that begin with #!).

Some interpreters (like perl) choose to implement workaraounds, but if you really need to make a script suid, it is very easy to achieve so with a simple C wrapper program.

There are no plans to implement any perl-like workaround in PHP at the present time.
 [2003-03-26 09:38 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at

Uid of the binary, which is PHP is what matters, the script's uid does not matter since it is a parameter.
 [2010-06-13 03:21 UTC] php at richardneill dot org
In 2003, the response was:
  "There are no plans to implement any perl-like workaround in PHP at the
  present time."

Might I request that, 7 years later, and with much increased use of php as a general-purpose scripting language, it might be worth re-visiting this?
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